Lithium Pharmacokinetics in the Kidney: Mechanisms of Renal Dysfunction
In this video, Dr Jonathan Meyer explains how lithium is handled by the kidney and why its renal pharmacokinetics underpin both therapeutic safety and toxicity. He outlines lithium’s close physiological similarity to sodium and how this influences renal reabsorption.
The video highlights common clinical scenarios that increase toxicity risk, including sodium depletion, gastrointestinal losses, dehydration, and free-water replacement, alongside practical patient education strategies. Dr Meyer also introduces the role of the collecting duct and ENaC channels in lithium-induced polyuria, helping clinicians better anticipate renal adverse effects.
This video is an excerpt from the Lithium in Clinical Practice: Advanced Mood Stabilisation Training for Psychiatrists course available on The Academy by Psych Scene.
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Key Takeaways
- Lithium is freely filtered at the glomerulus and reabsorbed alongside sodium in the kidney.
- Sodium depletion and free-water replacement increase lithium reabsorption and toxicity risk.
- Gastrointestinal losses, sweating, and dehydration are common triggers for lithium toxicity.
- Patient education should emphasise electrolyte replacement rather than plain water during illness or heat exposure.
- Most lithium-related renal dysfunction arises in the collecting duct, particularly within principal cells.
- Lithium enters principal cells via ENaC channels, contributing to polyuria and impaired water reabsorption.
To build on the renal pharmacokinetics and lithium-specific prescribing principles discussed in this video, clinicians may find the Lithium in Clinical Practice: Advanced Mood Stabilisation Training for Psychiatrists course on The Academy by Psych Scene valuable. This on-demand curriculum provides a comprehensive, clinically grounded exploration of lithium use, including mechanisms of action, therapeutic monitoring, renal and endocrine safety, drug–drug interactions, and strategies for minimising toxicity while maintaining long-term efficacy.
The Psychopharmacology Masterclass Series further complements this content by examining core pharmacokinetic and pharmacodynamic principles across major psychiatric medications. This series supports clinicians in understanding drug–organ interactions, adverse effect mechanisms, and evidence-based psychopharmacological decision-making relevant to complex, real-world prescribing.
Subscribe to The Academy by Psych Scene on YouTube for clinician-focused videos on psychiatry, neuroscience, and evidence-based clinical practice.
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